Conveying pulverulent material



Nov. 28, 1933. 7 M. VOGEL-JORGENSEN 1,937,040

CONVEYING PULVERULENT MATERIAL Filed Aug. 23, 1932 2 Sheets-Sheet 1 ATTO N EYS Nbv.28,l933-- M.voeELuoRGENSEN 'L Z CONVEYING PULVERULENT MATERIAL Filed Aug. 25, 1932 2 Sheets-Sheet 2 MM VENTOR top Patented Nov. 1933 UNITED STATES 1,937,040 CONVEYING PULVERULENT m'raam Mikael Vogel-Jorgensen,

assignor to F. L. Smidth & 00., N. Y., a corporation of New Jersey Copenhagen, Denmark, New York,

Application August 23, 1932, No. 630,020,

and in Great Britain November 30, 1931 '41 Claims, (01. 30236) This invention relates to the conveying of pulverulent or granular material which in the mass is more or less fluent, such, for example,- as cement raw meal, cement, coal dust-and the like, in which a fluid under pressure, such as compressed air, is relied upon as the means by which movement of the material through a con- 1 duit is effected. In the conveying of such material by a fluid under pressure it is necessary to 1 provide means for compacting the material at a point in advance of that at which it is subjected to the action of the fluid under pressure so as to prevent the escape of the fluid under pressure in a direction opposite thatrin which the material is to be conveyed. This has been accomplished heretofore by delivering the'material to a point in advance of the application-of the fluid under' pressure" by a worm conveyor, the pitch of which is reduced as the material approaches the point, where the fluid under pressure applied so that. the material is compacted sufficiently to prevent the escape of the fluid under pressure in a di- 3 rection opposite to that of the movement of the material. This procedure, however, involves a comparatively large consumption of power in compacting the material to the desired degree, as well as rapid wear on the worm conveyor, It

is the object of the present invention to overcome the difficulties incident to the use of a worm 3o conveyor for the delivery of thematerial to the point at which the fluid under pressure takes efiect on the material and this general purpose is accomplished by the subjection oi the material, before it is subjected to the action of the fluid under pressure, to centrifugal action whereby the material, with much less consumption of power and with much less wear of movin arts of the apparatus, is compacted sufficiently to prevent the escape of the fluid under pressure in the wrong direction and to cause the force of the fluid under pressure to be exerted in rendering the material fluent and in conveying it through the conduit in which it is conducted to the place of delivery. The apparatus in which this method of conveying the material may be practiced comprises a hollow, rotating body to the central por-' -tion oi which the material to be conveyed is delivered by any suitable means, as, for example, by a worm conveyor of uniform pitch or by "fluid ressure, and in which the material so delivered is caused by centrifugal action to move toward the periphery of the rotating body where it is compacted by the centrifugal action and from. which it is discharged through an opening or openings into a chamber in which it is subjected to 'the action of the compressed air or other fluid under pressure by which itsfluent condition is maintained and it is itself caused to move through the conveyor'conduit. 7

Two different forms of apparatus in which the. 50 invention, so far as it consists in the improved method, can be practiced and in which the invention, sofar as it consistsin apparatus, can be embodied, are illustrated- Figure 1 being a view in sectional elevation of one convenient and practical form of such apparatus, and I Figure 2 being a similar view of the slightly different form of the apparatus.

In the form of apparatus shown in Figure 1 a portion of a conveyor conduit, which may be of greater or less length, is represented at 1, while a supply of air under pressure is sufliciently indicated by the pipe 2. ,The conduit 1 receives the material from a housing 20., forming a chamher 21 to which the air or other fluid under pressure is delivered by the pipe 2. In this instance the material is delivered by a screw conveyor 3 of uniform pitch from a hopper 4 to the inside of a hollow, rotating body 5 at its central porti'on. The chamber of this hollow, rotating body 5 to which the material is delivered, is formed between two plates 6 and "l, the plate 6 being preferably of slightly larger diameter than the V k plate 7 and formed with a .flange fi which 'overlaps the periphery of the plate '7, forming therewith a somewhat constricted throat 8. The hollow body 5 is rotated at a considerable speed by any suitable means, sufficiently indicated by the band pulley 10, and in such rotation of the hollow body the material which is fed to it is bycentrifugal action thrown out toward the periphery of the body and is compacted at the periphery,

escaping through the co the inner surface of'the flange 6 from which may be dislodged into the chamber 21 formed, by the housing 20, by any suitable means, such as a scraper 9 introduced through the wall of the housing 20. As the material is thus dislodged from the rapidly rotating body 5 it falls into the chamber 21 of the housing 20 and is immediately propelled therefrom and through the conveyor conduit 1 by the air or other fluid'under pressurewhiclf is supplied to the chamber 21 by 105 the pipe 2, being at the same time mingled with l the fluid under pressure and thereby maintained ina fluid condition Packing boxes may be provided, as at 11, between the housing 20 and the extended shaft 3 of the conveyor and as at-12, 1

nstricted throat 8 upon screw conveyor 3.

Q to

between the housing and the casing 3 of the F The embodiment of the invention illustrated in Figure 2 isgenerally similar to-that illustrated in Figure 1, comprising a housing 20, a conveying conduit 1, a compressed air supply indicated at 2 and a hollow rotating body 5* formed. of plates 6* and 7 with a constricted discharge throat at 8X. In this instance, the materialis supplied to the hollow rotating body, at its central por-. tion, under air pressure, through a delivery pipe 13 and the hollow rotating body is expanded in an axial direction so as to form a somewhat enlarged chamber. 14. In this instance, the shaft 3, provided with a driving means, indicated by the pulley 10, is shown" as axially bored, as at 15, so that it may be connected to an exhaust fan or other suction device, not necessary to be shown, for the purposeof creating an unbalanced air pressure under which the material is delivered tothe hollow rotating body. The operation of this form of apparatus is the same.

as described with reference to Figure 1 and need not be further explained herein it'being understood that a device 9 may be provided for the purpose of dislodging the material which, having been compacted in the constricted throat of,

the hollow rotating body, is inner face of the flanged".

Other forms of apparatus in which the improved method can be practiced will'readily suggest themselves andit will'be understood that, except as indicated in the accompanying claims,

discharged upon-the 'the invention is notrestricted to any particular form of apparatus.

I claim as my invention:-

1. In an apparatus forv conveying Dulverulent material, the combination of a housing, a con- 'ply the material supply the material to the conveyor to supply the veying conduit connected to the housing, means to supply fluid under pressure to the housing, a hollow body mounted ,within the housing and having a constricted opening at" its periphery, meansto rotate the hollow body, means to supportion thereof, and means to dislodge the material from the hollow body into the housing and conduit.

2. In an apparatus for conveying pulverulent veying conduit connected to the housing, means to supply fluid under pressure to the housing, a hollow body mounted within the housing and formed of two plates, the" one overlapping the other and forming therewith a constricted throat,

to the hollow body'at the'central" material, the combination of a housing, a c0n'- means to rotate the hollowbody, and means to I I hollow body at the central portion thereof.-

3. Inanapparatus for conveying pulverulent material, the combination of a housing, a conveying conduit connected to the housing, means pressure tothe housing, a

to supply fluid under hollow body mounted within the housing and having a constricted opening at its periphery,-

connected to the housing,.means [its 

